tag:blogger.com,1999:blog-8108206024152066470.post3001863188439208516..comments2023-10-03T12:40:10.921+02:00Comments on My E-Life Now !: LiFePO4 Battery Charging Method - Don't Ruin your Expensive Cells !Christophe HUBERThttp://www.blogger.com/profile/11239170910670712670noreply@blogger.comBlogger28125tag:blogger.com,1999:blog-8108206024152066470.post-50099771387285332612017-01-18T17:11:07.269+01:002017-01-18T17:11:07.269+01:00Hi Jack,
Check out my mini ESS built using AESC LE...Hi Jack,<br />Check out my mini ESS built using AESC LEAF Cells : http://www.myelifenow.com/2014/11/buidling-mini-energy-storage-system-ess.html<br />You will know the voltage limits usedChristophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-48101052518796139952017-01-14T18:59:26.029+01:002017-01-14T18:59:26.029+01:00Hi Christophe,
What voltage limits do you re...Hi Christophe,<br /><br /> What voltage limits do you recommend for Leaf cells?<br /> Thanks,<br /> JackAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-37983441997447795592017-01-10T14:42:39.131+01:002017-01-10T14:42:39.131+01:00Bottom balancing using the device will drop the vo...Bottom balancing using the device will drop the voltage down to 2.75V maybe but you have to do it to the same cell several times and let is sit there for 24h and do it again, until it really is at 2.75V<br />There is no absorption or float in LiFePO4, and I do charge up to 28V, then shutdown the charger, so the pack voltage then drops down to 26.6V usually, each cell remaining then, at rest, at Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-57214907007207534132017-01-04T01:55:34.285+01:002017-01-04T01:55:34.285+01:00I have an 8 cell pack of the newer Calb (light gre...I have an 8 cell pack of the newer Calb (light grey) cells. Bottom balanced using your exact method and a powerlab 8. Cells were all with pin .01v. Then I charged to 28v using the same voltage for both absorption and float. The pack sits around 28.1v. Testing each cell, I found one cell at 3.69 and another at 3.84v. I could probably live with the one that hit 3.69 just by dropping my charging Kirkhttps://www.blogger.com/profile/09726128108401757617noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-38722375955182381722016-05-25T17:28:29.219+02:002016-05-25T17:28:29.219+02:00Can you point me to a link in whcih he talks about...Can you point me to a link in whcih he talks about Headway cells?...I have tried this technique again this time, with 2 BMS modules connected. Now they have remained constant at the bottom of the SOC.I charge ( and monitor each cell) untill one hits 3.7 volts and at this point usually all are within 3.45-3.55 volts...when they are discharged the remain very close to the same as they approach 3.2 Anonymoushttps://www.blogger.com/profile/11540210462013199799noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-90413036139178090872016-03-05T12:39:13.102+01:002016-03-05T12:39:13.102+01:00Sorry to hear that but I heard about problems with...Sorry to hear that but I heard about problems with Headway cells (from Jack RICKARD)<br />I use CALB only <br />I applied the same technique to 18650 and leaf cells (different voltage limits off course) and no problem <br />Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-16623955509654484742016-03-05T04:39:51.319+01:002016-03-05T04:39:51.319+01:00This comment has been removed by a blog administrator.Anonymoushttps://www.blogger.com/profile/11540210462013199799noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-82123533600516868572016-03-05T04:39:41.560+01:002016-03-05T04:39:41.560+01:00Sorry but I dont believe this is true. I have 28 h...Sorry but I dont believe this is true. I have 28 headway cells that I labourously discharged to 2.7 volts each and re-assembled...charged untill one reached 3.6 volts..(they were not all the same..as they rose in voltage from 2.75 volts they remained the same untill some reached 3.5 volts..some took off and others stay around 3.4+ volts...so after using the pack at about half capacity, recharged Anonymoushttps://www.blogger.com/profile/11540210462013199799noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-5688177227772622032014-12-29T20:25:38.418+01:002014-12-29T20:25:38.418+01:00Herbert,
No the initial charge is done by the manu...Herbert,<br />No the initial charge is done by the manufacturer <br />And never charge more than 3.65V for LiFePO4Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-65807177330116667122014-12-29T15:47:15.456+01:002014-12-29T15:47:15.456+01:00Does the initial charge to 4V have to be made on n...Does the initial charge to 4V have to be made on new batteries before your bottom balancing, or not?<br /><br />Best regards<br />HerbertAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-65610182591799132092014-01-14T20:18:20.322+01:002014-01-14T20:18:20.322+01:00I did not invent this but followed Jack RICKARD...I did not invent this but followed Jack RICKARD's work over 5 years of conversions using LiFePO4. I did exactly like him, almost, cutting the charge at 3.5V to prevent any problem but anyways like he says "there is nothing much after that" <br />I suggest you watch every episode of EVtv on YouTube and learn like I did :-)<br />Follow people with experience not only trying to sell Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-15579326464852121532014-01-14T15:30:26.496+01:002014-01-14T15:30:26.496+01:00Hi again.
Agreed! If you undercharge to 3.5 you sh...Hi again.<br />Agreed! If you undercharge to 3.5 you should have ample room for the smallest cell.<br />But then again, your not using the full capasity of the battery, probably not more than 80%.<br />I'm working on a 12V 1000ah emergency supply, and leaving 200Ah is a bit much.<br />(Thats a lot of dollars, i could use on my wife....) <br />But there are so much disinformation out there! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-52120896202242729992014-01-14T14:44:05.040+01:002014-01-14T14:44:05.040+01:00Hi Svein,
That is right and this is why you have t...Hi Svein,<br />That is right and this is why you have to Bottom Balance each cell, and Under Charge the pack to 3.5V x number of cells<br />This method works perfectly: after a year of charge & discharge everyday my cells are still in balance. Jack RICKARD now has a 100 cell VW Thing running, so the number of cells does not matter really<br /><br />Christophe Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-38065715801111765702014-01-14T14:19:16.602+01:002014-01-14T14:19:16.602+01:00Hi.
Very interesting post.!
I have had the same p...Hi.<br />Very interesting post.! <br />I have had the same problem With some cells slowly decading, and have also come up With the same solution, exept the initial draining of all cells. <br />This is to find and detect the "smallest" cell, as the battery pack will have no more Ah than the cell with the least capasity.<br />BUT, I think you are missing one important step.(?)<br />After Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-60328252606168071162013-12-24T20:47:38.939+01:002013-12-24T20:47:38.939+01:00Hi,
Same thing for all LiFePO4 cells, but 2,75V is...Hi,<br />Same thing for all LiFePO4 cells, but 2,75V is for initial bottom balance, after that, set lower limit to 3V or 2.9V not lower, and upper to 3.55V. Merry Christmas !<br /><br />Christophe Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-71042093822697088012013-12-24T17:46:11.541+01:002013-12-24T17:46:11.541+01:00Hi Christophe,
I have Winston 100Ah cells. Can I u...Hi Christophe,<br />I have Winston 100Ah cells. Can I use same voltage levels - lowest 2.75 and highest 3.5V, for these cells?<br />Thank You.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-69969625555668014512013-12-17T08:42:30.083+01:002013-12-17T08:42:30.083+01:00Hi Chris,
Yes à y size of cell, it works as long...Hi Chris, <br /><br />Yes à y size of cell, it works as long as it is LiFePO4Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-22729855898173563972013-12-16T23:37:54.552+01:002013-12-16T23:37:54.552+01:00Hi Christophe, can I ask will this method work on ...Hi Christophe, can I ask will this method work on smaller cells for an E-Bike? Chris Davisonnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-16732870962542008252013-12-12T13:22:45.193+01:002013-12-12T13:22:45.193+01:00You're welcome, I am glad it helps :-)You're welcome, I am glad it helps :-)Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-20889236139688417132013-12-12T02:02:26.541+01:002013-12-12T02:02:26.541+01:00Thank you, Christophe. Your method is amazing! I&#...Thank you, Christophe. Your method is amazing! I'm a few days away from completing my pack! lolAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-86065205130656162332013-11-04T10:30:36.784+01:002013-11-04T10:30:36.784+01:00Hi Katrina,
Yes it does, you can as many strings ...Hi Katrina, <br />Yes it does, you can as many strings in parallel as you want<br />Regards,<br />Christophe Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-8046770149135494172013-11-04T00:02:57.484+01:002013-11-04T00:02:57.484+01:00Wow, that's a lot of capacity.. one more quest...Wow, that's a lot of capacity.. one more question: so I tried and it really worked for one string ! Does this method work when I have multiple strings in a pack (each string consisting of same number of cells) ? -KatrinaAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-44281437050938997902013-10-11T11:17:52.093+02:002013-10-11T11:17:52.093+02:00Michael,
Nothing should be done at a cell level, o...Michael,<br />Nothing should be done at a cell level, otherwise you start creating inbalances and problems; Always put/remove energy in/from the WHOLE pack of cells; Of course after each cell has been initially bottom balanced like the other one son the same series string.<br /><br />Christophe Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-89006802230310764042013-10-10T16:29:59.077+02:002013-10-10T16:29:59.077+02:00lifepo4 battery management: Suppose you used power...lifepo4 battery management: Suppose you used power mosfets to switch a battery into the series circuit if in discharge and the voltage across the battery>2.85 volts, or to be bypassed if less, and similar in charging at the 3.55 volt level? Anonymoushttps://www.blogger.com/profile/11447598297872228006noreply@blogger.comtag:blogger.com,1999:blog-8108206024152066470.post-52133608163993094702013-10-01T10:44:36.254+02:002013-10-01T10:44:36.254+02:00Hi Katrina, Actually these new CALB CA180FI have a...Hi Katrina, Actually these new CALB CA180FI have a Real Capacity much higher: from 190Ah to 195Ah ; amazing isn't it ? :-)Christophe HUBERThttps://www.blogger.com/profile/11239170910670712670noreply@blogger.com